build: update verdaccio to version 4.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
verdaccio (source)	4.8.1 -> 4.9.0

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Release Notes

verdaccio/verdaccio

v4.9.0

Compare Source

Features

• migrate yarn 1 to yarn 2 (#​1962) (1ece11c)
• update docker base image to node 14.15.0 (#​1992) (f901749)

Bug Fixes

• buffer deprecated warnings (#​1993) (4feaf24)
• check author if lastest is not found (#​1994) (185babc)
• package.json & yarn.lock to reduce vulnerabilities (#​1910) (cb5a8a7)
• update dependencies (#​1965) (1443b73)
• update dependencies (#​1991) (ef51294)
• update dependencies, docker base and build deps (#​2007) (6eef015)
• deps: bump @​verdaccio/ui-theme from 1.12.1 to 1.13.1 (#​1961) (f7aad33)
• update Dockerfile to Node v12.18.4 (#​1945) (b409c01)

4.8.1 (2020-08-06)

Bug Fixes

• package.json & yarn.lock to reduce vulnerabilities (#​1879) (7c50d87)
• package.json & yarn.lock to reduce vulnerabilities (#​1889) (5e94478)
• update readme library (#​1892) (f75ad87)
• upgrade docker base image nodejs (#​1895) (261eab5)

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